武汉新港区域竞争优势培育及对策分析

武汉新港作为武汉航运中心的核心和武汉城市圈物流中心职能最主要的载体,其竞争力的提高对城市圈区域一体化的实现与区域地位的提升具有重要意义。作者通过分析武汉新港＂区域化＂发展过程中面临的长江经济带港口城市的竞争压力、内部资源整合、港区建设、航运服务业发展等问题,提出了＂高地＂、＂洼地＂、＂园区经济＂的区域经济竞争途径和形式。     

Four general principles for the management and conservation of wetlands in large lakes: The role of water levels,nutrients, competitive hierarchies and centrifugal organization

The most important factor in shoreline wetlands is variation in water depth. Superimposed upon this are gradients of soil fertility, ranging from sandy, open shorelines to sheltered, fertile bays. The use of both transplant and pot experiments shows that competitive hierarchies rapidly arise in wetland vegetation and that species are sorted along exposure and depth gradients according to their relative competitive abilities. These patterns can be summarized in the centrifugal organization model, in which competitive dominants occupy preferred core habitats and where different species and vegetation types are then arrayed outward along different constraint gradients ( Wisheu & Keddy 1992 ). Knowledge of these general patterns provides an essential tool for managing lakes and reservoirs in order to maintain and enhance biological diversity.     

试论三江平原生态建设

三江平原经过50多年的开发,不但没有形成一个好的湿地农业生态体系,而且使原湿地生态系统也遭到严重破坏.三江平原湿地生态建设中既要保护重建湿地生态,又要建设湿地农业生态,发展经济,应消化吸收古今中外湿地生态建设的经验与技术,探索三江平原生态建设的策略与措施,实现三江平原生态经济可持续发展.